听取依赖财产的变化 [英] Listen to changes of dependency property

问题描述

有没有办法听取 DependencyProperty 的更改？我想要通知并在值更改时执行一些操作，但我无法使用绑定。它是另一个类的 DependencyProperty 。

Is there any way to listen to changes of a DependencyProperty? I want to be notified and perform some actions when the value changes but I cannot use binding. It is a DependencyProperty of another class.

推荐答案

code> DependencyProperty 一个单独的类，最简单的方法是绑定一个值，并监听该值的变化。

If it's a DependencyProperty of a separate class, the easiest way is to bind a value to it, and listen to changes on that value.

如果DP是您在自己的类中实现的DP，那么您可以 DependencyProperty 时，noreferrer>注册PropertyChangedCallback 。您可以使用它来监听属性的更改。

If the DP is one you're implementing in your own class, then you can register a PropertyChangedCallback when you create the DependencyProperty. You can use this to listen to changes of the property.

如果您正在使用子类，可以使用 OverrideMetadata 将您自己的 PropertyChangedCallback 添加到DP将被调用而不是任何原始的。

If you're working with a subclass, you can use OverrideMetadata to add your own PropertyChangedCallback to the DP that will get called instead of any original one.

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